Music overlapping/doesn't start/stop switching pages

Hi Bertrand!

I find your plugin just exquisite, yet It would be amazing if you could help me fix this:

music should start just on these two pages

http://www.luigiambrosio.it/portfolio/fotosciop/

and

http://www.luigiambrosio.it/portfolio/tutto-il-mondo-e-palese/

It seems that music just overlaps/doesn’t start/stop until I refresh the page itself.
Same problem on Chrome and Safari.

As I surely am not a WP/php/css pro, I just can assume that it’s a theme conflict, as it actually seems not to refresh pages from scratch.

Do you think there’s a way to let the plugin work properly?

Thanks in advance!

P.s.
Please note that the site is under construction, don’t be scared of the silly things you might find around! 😉

https://wordpress.org/plugins/soundy-background-music/